How to print the unique field names in the first line of many files?

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Peter Schneider
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How to print the unique field names in the first line of many files?
I hope you found a solution that worked for you :)
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Thanks to all those great people for their contributions!

(stackoverflow.com/users/1248535/roger-costello)Roger Costello
(stackoverflow.com/users/1745001/ed-morton)Ed Morton
(stackoverflow.com/users/548225/anubhava)anubhava
A special thanks goes out to the (stackoverflow.com/questions/79315592/how-to-print-the-unique-field-names-in-the-first-line-of-many-files)Stackexchange community

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